JPS6150516A - Electric pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric water heater for heating and keeping a stored liquid warm.0 Prior Art A conventional electric water heater of this type is known from, for example, Japanese Patent Laid-Open No. 59-8
As shown in Japanese Patent No. 5617, it had a structure as shown in FIG. That is, in the figure, 1 is a heat exchanger plate whose center part protrudes upward in a circular shape, and the outer edge of this heat exchanger plate 1 is fixed to the lower end of the cylindrical body in a liquid-tight manner by means such as welding. A metal container 2 is formed. 3 is an exterior body that encloses the container 2 with a space therebetween.

A heat generating board 4, which has a main power generating part and an auxiliary heat generating part wrapped together with a heating wire, is inserted into the lower surface of the heat transfer plate 1, with the upper and lower parts stacked with insulating plates. It has a through hole in the part. The heat generating plate 4 is built into the lower surface of the heat exchanger plate 1 in a compressed state by a thermally conductive heat diffusion plate 7 having a through hole in the center and a backing material 8, thereby forming a heat generating body portion.

A heat shield plate 5 is provided below the heating element part, and a temperature controller 6 is attached below the center of the heat transfer plate 1 (
-1' screws 9, and a temperature-sensitive reed switch (not shown) is attached to the retracting blade on the outer peripheral side of the heat exchanger plate 1. Further, the above-mentioned main heating section is connected to the temperature controller 6, and the auxiliary heating section is connected to the temperature-sensitive reed switch through an electrical circuit to form a parallel circuit, thereby configuring the heating element and temperature control device of the electric water heater. ing.

Problems to be Solved by the Invention However, in such a conventional configuration, the amount of heat from the heat generating plate 4 is thermally conducted through the upper and lower insulating plates. The heat transfer plate 1 is transferred from the plate 4 through only the insulating plate with low thermal conductivity, with insufficient heat diffusion.
As a result, the surface of the heat exchanger plate 1 is locally heated, and a gap is created at the contact area between the heating element 4 and the heat exchanger plate 1, resulting in poor heat conduction and poor heat transfer. This had the disadvantage that discoloration occurred locally on the surface of the plate 1. If the situation worsens further, there is a problem in that the auxiliary heat generating part for low power use meanderes due to thermal expansion and comes into contact with the main heat generating part, resulting in short circuit or disconnection.

Also, since each of the parts that make up the heating element is circular,
It becomes difficult to regulate the mutual positions of the component parts, and therefore it is extremely difficult to secure a distance of 7 insulating distances at the heating wire lead-out section, and it is also extremely difficult to prevent the entire heating element from rotating, which has disadvantages in terms of assembly work. Was.

The present invention is intended to solve these problems, and aims to provide an electric water heater that is excellent in terms of improved lifespan of the heating element, ease of assembly, discoloration life of the heat exchanger plate, and heating efficiency. It is.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a heat-generating plate whose protruding part on the bottom of the container has an abbreviated shape, and whose upper and lower surfaces are covered with insulating plates; First and second thermally conductive heat diffusion members disposed above and below the heat generating plate constitute a heat generating body part, and 1.
and a second heating wire with a lower power than the first heating wire, and the plate thickness or wire diameter of the first and second heating wires are the same, or The second heating wire has a larger plate thickness or wire diameter than the first heating wire as a heating element, and the heating plate is made of a backing material formed on the back side of the heat exchanger plate to correspond to the heat exchanger plate. It is attached by pressure bonding to the lower surface of the heat exchanger plate.

Function According to the above configuration, the second heating wire for low power use which is heated for a long time is connected to the upper and lower insulating plates and the first wire having good thermal conductivity. Since it is attached by pressure bonding (by the second heat diffusion member), meandering of the heating wire during durability due to thermal expansion is prevented, and heat is efficiently transferred to the heat transfer plate. It is possible to improve the life of the heating element.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6. In the figure, reference numeral 21 denotes a heat transfer plate whose central portion projects upward in an abbreviated shape to form an outer peripheral side edge 21a;
Temperature sensing surface 21c on the lower surface of the cut peripheral edge 21b
A metal container 22 is formed by having an outer edge portion liquid-tightly fixed to the lower end of the cylindrical body by means such as welding.

23 is an exterior body that encloses the container 22 with a space therebetween.

On the lower surface of the heat transfer plate 21 described above, a heating plate 24 in which a first heating wire and a second heating wire of low power, which will be described later, are integrally wound is stacked between upper and lower insulating plates 26 and 26. A first heat diffusion plate 27 having good thermal conductivity is disposed on the upper surface of the upper insulating plate 25. Furthermore, the heat generating plate 24 has a through hole in the center, and a pressing allowance is provided on the lower surface of the heat transfer plate 21 by a second heat diffusion plate 28 having good thermal conductivity and a backing material 29 having an outer peripheral side part 28a. In this state, it is fixedly built-in by spot welding or the like to form a heating element.

The first electric heat Ivj of the heating element portion! A splicing line is provided on the end side of the 6th part of each of the lead wires 32, 33, and 34 of the 3Q and second heating wires 31 by wrapping a good conductive member, and one end of this splint wire is provided. The second heat diffusion plate 28 is used to tightly press and press them together. In addition, the thickness or wire diameter of the first heating wire 30 and the second heating wire 31 of low power are the same, or the second heating wire 30 has the same thickness or wire diameter.
The thickness or wire diameter of the heating wire 31 is configured to be larger than that of the first heating wire 3o. Furthermore, the electric heating plate 24 is formed into a flat plate by winding a plurality of LS, cores 24a, and 24bjC heating wires. Insulating plate 25.
Either or both of 26, absolutely,) uncorked 24
a, 24b In order to prevent each other from riding on each other, a metal piece 3 that is equal to or smaller than the plate thickness or wire diameter of the first heating wire 30 is used.
5 is fixed by penetrating it and bending it. On the other hand, on the drawing medium side of the heating wire, insulating cores 24a and 24b
By providing an appropriate gap at the abutting part of the insulating core 24a and passing the lead wire through the lower insulating plate 26, the insulating core 24a
.

24b prevents each other from jumping on top of each other. Furthermore, among the three lead wires 32°33.34, which have one end of the first heating wire 30 and the second heating wire 31 of low power as a common lead wire, the second heating wire 31 is a common lead wire. Another lead line 33 is located at the center.

Note that the backing material 29 is provided with a notch 29a of an appropriate size on the D-cut outer peripheral side. Further, a substantially Z-shaped container fitting 37 for fixing a two-heat plate 36, which will be described later, is fixed to the backing material 29. Further, the D-cut g5 of the approximately shaped protrusion of the container 22 is located in the direction of the water level gauge 38 provided on the outer cylindrical wall of the container 22.

ing.

Further, a heat shield plate 36 is provided below the heating element.
This heat shield plate 36 is provided with a square hole portion of an appropriate size corresponding to the notch 29a of the backing material 29. Further, a temperature controller 39 is installed in the center of this heat shield plate 36 by a mounting spring 4o, a temperature sensitive reed switch 41 and a temperature fuse 42 are integrated with a good heat conductive material, and the backing material 29 is
They are temporarily assembled using presser springs 43 at positions corresponding to the notches 29a, and the wiring base 44 is further fixed.
1 has been done. This therefore frees up space for major wiring work. Further, this heat shield plate 36 is attached to the bottom surface of the container 22 via the container fittings 37 to provide a temperature FJH.
The J device 39 and the integrated heat-receiving parts of the temperature-sensitive reed switch 41 and temperature fuse 42 are fixed by mounting brackets 45 so as to be in close contact with each other.

The first heating wire 3o is connected to a temperature controller 39, and the M2 heating wire 31 is connected to a temperature-sensitive reed switch 41 through electrical circuits to form a parallel circuit, and a temperature fuse 42 is connected in series. This constitutes an electric water heater.

In the above configuration, when a liquid is stored in the container 22 and electricity is started, the heating plate 24 is heated, and the heat is sufficiently diffused by the first heat diffusion plate 27 via the insulating plate 25, and then the heat transfer plate 21
Heat is transferred to the liquid through the -C At the same time, heat is also diffused toward the outer peripheral side through the second heat diffusion plate 28.

The heat transferred to the backing material 29 by the second heat diffusion plate 28 is transferred to the outer peripheral side and is used to heat the liquid. When the liquid reaches a certain temperature (/?-), the temperature unit 39 connected to the central protrusion of the heat exchanger plate 21 is activated, and the first heating wire 30 is turned off, causing low power consumption. second heating wire 3
Only 1 is energized. When the liquid reaches a certain temperature by further slow temperature rise, the temperature-sensitive lead switch 41
is activated and turns off. When the liquid temperature drops, the temperature-sensitive reed switch 41, which turns off before the temperature controller 39, operates and remains in the off state, and then repeats the on-second cycle, ensuring a low-power heat retention state. do. Further, if the temperature controller 39 is left in the ON state due to a failure, the electric circuit of the temperature fuse 42 is blown out and the power to the entire device is turned off to ensure safety.

As described above, the plate thickness or wire diameter of the second heating wire 31 for low power is the same as or larger than the first heating wire 30, and by making it particularly large, As shown in the figure, the heating wire will inevitably be suppressed and dug into the Fj board 25 and the insulating core 24&, and as a result, it is possible to prevent the heating wire from meandering during durability, and it can also lead to meandering, short circuits, and disconnections. The time can be extended and therefore the lifespan can be increased.

In addition, since the first heat diffusion plate 27 is added between the insulating plate 25 on the heating plate 24 and the heat transfer plate 21, even in the dry baking state, the ordered heat is sufficiently diffused and the heat transfer plate 21, and as a result, no local heating occurs.
Discoloration of the surface of the heat exchanger plate 21 can be reduced. In addition, since sufficient heat diffusion occurs, the heat conduction area is expanded, and as a result, heating efficiency can be improved. The other end is tightly pressed with the second heat diffusion plate 28 and the backing material 29,
In addition, since the outlet of the other lead wire 33, which is different from the common terminal of the low power second heating wire 31, is located in the center of the king, the extension wire portion of the high wattage lead wires 32 and 34 is The presser allowances C and e can be made longer, and as a result,
Not only can a reliable splicing wire clamping pressure be achieved, but also heat generation in the lead wire portion can be reduced, resulting in a longer service life.

Furthermore, since the members constituting the heat exchanger plate 21 and the heating element part of the container 22 are partially D-cut, the D
The cut circumferential edge 21b ensures the mutual positional regulation of the component parts, and in particular ensures the insulation distance between the heating wire lead-out portion from the heating panel 24, the second heat diffusion plate 28, and the backing material 29. It is possible to easily and reliably improve the assemblability.

Effects of the Invention As described above, according to the present invention, the plate thickness or wire diameter of the second heating wire for low power is made equal to or larger than that of the first heating wire, and in particular, By increasing the size, it will be suppressed by the insulating plate and the insulating core, which will prevent the heating wire from meandering during durability, and also extend the time it takes for meandering, short circuits, and disconnections to occur. In addition, since the first heat diffusion plate is added between the insulating plate and the heat transfer plate on the heat generating plate, the lifespan can be extended. ′″
″′″+″″′″″″″″″′−1”41 As a result, local heating does not occur, so discoloration of the surface of the heat exchanger plate can be reduced. Due to heat diffusion, the heat conduction area has been expanded.
As a result, it is possible to improve heating efficiency.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of an electric water heater showing an embodiment of the present invention, showing the dimensional relationship between the insulating plate, the insulating core, and the heating wire. Figure 2 is a longitudinal cross-sectional view of the entire water heater, and Figure 3 is a cross-sectional view of the heating element of the water heater. In the figure, a is a cross-sectional view of the whole,
b is a partially enlarged cross-sectional view, FIG. 4 is an exploded perspective view of the heating element, and FIG. 5 is a state in which the heating wire is wound around the heating element. 6 is a plan view showing a temporarily assembled state of the heat shield plate, and FIG. 7 is a longitudinal sectional view of the entire conventional electric water heater. 21... Heat exchanger plate, 22... Container, 24
...Heating plate, 25, 26...Insulating plate, 27...First heat diffusion plate, 28...Second heat diffusion plate, 29... ...Backing material, 30...First heating wire, 31...Second heating wire. Name of agent: Patent attorney Toshio Nakatashi and one other person? 4-
--Starting and stopping Fig. 1 37- Twisting the 2nd / Figure (α) Figure 6 Figure 7 856 γ

Claims (1)

[Claims] A heating element is attached to the back side of the bottom of a container that is cylindrical with a bottom and has a heat transfer plate protruding from the bottom in a substantially D-shape, and this heating element is
It consists of a heat generating plate whose upper and lower surfaces are covered with insulating plates, and first and second heat diffusion members with good thermal conductivity arranged above and below the heat generating plate, and has a through hole in the center. and a backing material formed to correspond to the heat exchanger plate, the heat generating plate having a through hole in the center and the first
and a second heat diffusion member is attached by pressure bonding to the lower surface of the heat exchanger plate, and the heating plate includes a first heating wire and a second heating wire having a lower power than the first heating wire. and the plate thickness or wire diameter of the first and second heating wires are the same, or the plate thickness or wire diameter of the second heating wire is larger than that of the first heating wire. An electric water heater with a heating element.